�In the late 1920s and the 1930s, at the end of many performances, all of the musicians, singers, and dancers would get together on stage and do one last routine: the Shim Sham, Shim Sham Shimmy or just Sham. Dancers would perform technical variations, while singers and musicians would shuffle along as they were able.� In the heat of the night, let those sweaty numbers melt down any worries. No top hat and gator shoes required� just shake that ass!